﻿using System;
using System.IO;
using System.Net;

namespace CSharp.Libs.Net
{
    public class FtpHandler
    {
        #region declarations
        private string host = null;
        private string user = null;
        private string pass = null;
        private FtpWebRequest ftpRequest = null;
        private FtpWebResponse ftpResponse = null;
        private Stream ftpStream = null;
        private int bufferSize = 2048;
        #endregion



        #region constructor
        public FtpHandler(string hostIP, string userName, string password) { host = hostIP; user = userName; pass = password; }

        #region dispose pattern (http://www.codeproject.com/Articles/15360/Implementing-IDisposable-and-the-Dispose-Pattern-P)
        // some fields that require cleanup
        private bool disposed = false; // to detect redundant calls

        protected virtual void Dispose(bool disposing)
        {
            if (!disposed)
            {
                if (disposing)
                {
                    // clean up managed handles here
                    if (ftpRequest != null) { ftpRequest = null; }
                    if (ftpResponse != null) { ftpResponse = null; }
                    if (ftpStream != null) { ftpStream.Dispose(); ftpStream = null; }
                }

                disposed = true;
            }
        }

        public void Dispose()
        {
            Dispose(true);
        }
        #endregion
        #endregion



        #region properties
        public string HostIP { get { return host; } }
        #endregion



        #region methods
        /* Download File */
        public void download(string remoteFile, string localFile)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Get the FTP Server's Response Stream */
                ftpStream = ftpResponse.GetResponseStream();
                /* Open a File Stream to Write the Downloaded File */
                using (FileStream localFileStream = new FileStream(localFile, FileMode.Create))
                {
                    /* Buffer for the Downloaded Data */
                    byte[] byteBuffer = new byte[bufferSize];
                    int bytesRead = ftpStream.Read(byteBuffer, 0, bufferSize);
                    /* Download the File by Writing the Buffered Data Until the Transfer is Complete */
                    try
                    {
                        while (bytesRead > 0)
                        {
                            localFileStream.Write(byteBuffer, 0, bytesRead);
                            bytesRead = ftpStream.Read(byteBuffer, 0, bufferSize);
                        }
                    }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    localFileStream.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return;
        }

        /* Upload File */
        public void upload(string remoteFile, string localFile)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + remoteFile);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
                /* Establish Return Communication with the FTP Server */
                ftpStream = ftpRequest.GetRequestStream();
                /* Open a File Stream to Read the File for Upload */
                using (FileStream localFileStream = new FileStream(localFile, FileMode.Create))
                {
                    /* Buffer for the Downloaded Data */
                    byte[] byteBuffer = new byte[bufferSize];
                    int bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
                    /* Upload the File by Sending the Buffered Data Until the Transfer is Complete */
                    try
                    {
                        while (bytesSent != 0)
                        {
                            ftpStream.Write(byteBuffer, 0, bytesSent);
                            bytesSent = localFileStream.Read(byteBuffer, 0, bufferSize);
                        }
                    }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    localFileStream.Close();
                    ftpStream.Close();
                    ftpRequest = null;
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return;
        }

        /* Delete File */
        public void delete(string deleteFile)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)WebRequest.Create(host + "/" + deleteFile);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.DeleteFile;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Resource Cleanup */
                ftpResponse.Close();
                ftpRequest = null;
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return;
        }

        /* Rename File */
        public void rename(string currentFileNameAndPath, string newFileName)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)WebRequest.Create(host + "/" + currentFileNameAndPath);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.Rename;
                /* Rename the File */
                ftpRequest.RenameTo = newFileName;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Resource Cleanup */
                ftpResponse.Close();
                ftpRequest = null;
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return;
        }

        /* Create a New Directory on the FTP Server */
        public void createDirectory(string newDirectory)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)WebRequest.Create(host + "/" + newDirectory);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.MakeDirectory;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Resource Cleanup */
                ftpResponse.Close();
                ftpRequest = null;
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            return;
        }

        /* Get the Date/Time a File was Created */
        public string getFileCreatedDateTime(string fileName)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + fileName);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.GetDateTimestamp;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Establish Return Communication with the FTP Server */
                ftpStream = ftpResponse.GetResponseStream();
                /* Get the FTP Server's Response Stream */
                using (StreamReader ftpReader = new StreamReader(ftpStream))
                {
                    /* Store the Raw Response */
                    string fileInfo = null;
                    /* Read the Full Response Stream */
                    try { fileInfo = ftpReader.ReadToEnd(); }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                    /* Return File Created Date Time */
                    return fileInfo;
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            /* Return an Empty string Array if an Exception Occurs */
            return "";
        }

        /* Get the Size of a File */
        public string getFileSize(string fileName)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + fileName);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.GetFileSize;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Establish Return Communication with the FTP Server */
                ftpStream = ftpResponse.GetResponseStream();
                /* Get the FTP Server's Response Stream */
                using (StreamReader ftpReader = new StreamReader(ftpStream))
                {
                    /* Store the Raw Response */
                    string fileInfo = null;
                    /* Read the Full Response Stream */
                    try { while (ftpReader.Peek() != -1) { fileInfo = ftpReader.ReadToEnd(); } }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                    /* Return File Size */
                    return fileInfo;
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            /* Return an Empty string Array if an Exception Occurs */
            return "";
        }

        /* List Directory Contents File/Folder Name Only */
        public string[] directoryListSimple(string directory)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + directory);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Establish Return Communication with the FTP Server */
                ftpStream = ftpResponse.GetResponseStream();
                /* Get the FTP Server's Response Stream */
                using (StreamReader ftpReader = new StreamReader(ftpStream))
                {
                    /* Store the Raw Response */
                    string directoryRaw = null;
                    /* Read Each Line of the Response and Append a Pipe to Each Line for Easy Parsing */
                    try { while (ftpReader.Peek() != -1) { directoryRaw += ftpReader.ReadLine() + "|"; } }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;
                    /* Return the Directory Listing as a string Array by Parsing 'directoryRaw' with the Delimiter you Append (I use | in This Example) */
                    try { string[] directoryList = directoryRaw.Split("|".ToCharArray()); return directoryList; }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            /* Return an Empty string Array if an Exception Occurs */
            return new string[] { "" };
        }

        /* List Directory Contents in Detail (Name, Size, Created, etc.) */
        public string[] directoryListDetailed(string directory)
        {
            try
            {
                /* Create an FTP Request */
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + directory);
                /* Log in to the FTP Server with the User Name and Password Provided */
                ftpRequest.Credentials = new NetworkCredential(user, pass);
                /* When in doubt, use these options */
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;
                /* Specify the Type of FTP Request */
                ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                /* Establish Return Communication with the FTP Server */
                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
                /* Establish Return Communication with the FTP Server */
                ftpStream = ftpResponse.GetResponseStream();
                /* Get the FTP Server's Response Stream */
                using (StreamReader ftpReader = new StreamReader(ftpStream))
                {
                    /* Store the Raw Response */
                    string directoryRaw = null;
                    /* Read Each Line of the Response and Append a Pipe to Each Line for Easy Parsing */
                    try { while (ftpReader.Peek() != -1) { directoryRaw += ftpReader.ReadLine() + "|"; } }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                    /* Resource Cleanup */
                    ftpReader.Close();
                    ftpStream.Close();
                    ftpResponse.Close();
                    ftpRequest = null;

                    /* Return the Directory Listing as a string Array by Parsing 'directoryRaw' with the Delimiter you Append (I use | in This Example) */
                    try { string[] directoryList = directoryRaw.Split("|".ToCharArray()); return directoryList; }
                    catch (Exception ex) { Console.WriteLine(ex.ToString()); }
                }
            }
            catch (Exception ex) { Console.WriteLine(ex.ToString()); }
            /* Return an Empty string Array if an Exception Occurs */
            return new string[] { "" };
        }
        #endregion
    }
}
